package com.example.controller;

import com.example.common.R;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

@RestController
@RequestMapping("/common")
public class CommonController {
    @Value("${rui-ji.path}")
    private String basePath;

    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) throws IOException {
        String filename = file.getOriginalFilename();
        String suffix = filename.substring(filename.lastIndexOf("."));
        String stringName = UUID.randomUUID().toString() + suffix;

        File dir = new File(basePath);
        if(!dir.exists()){
            dir.mkdirs();
        }
        try {
            file.transferTo(new File(basePath+stringName));
        }catch (IOException e){
            e.printStackTrace();
        }

        return R.success(stringName);
    }

    @GetMapping("/download")
    public void download(String name, HttpServletResponse response) {
        //输入流，通过输入流读取文件内容
        try {
            FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));
            //输出流，通过输出流将文件写回浏览器，在浏览器展示
            ServletOutputStream outputStream = response.getOutputStream();

            response.setContentType("image/jpeg");

            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = fileInputStream.read(bytes)) != -1){
                outputStream.write(bytes, 0,len);
                outputStream.flush();
            }
            outputStream.close();
            fileInputStream.close();
        }catch (IOException e){
            e.printStackTrace();
        }


    }
}
